[MetalMan]

Some may have noticed my lack of being present over the last couple of days. Let's just say it was for a good cause :).

I probably spent a couple hours just deciding how the single battery pack (Maxamps 4s 5000mah) was going to fit the chassis. What I came up with is actually quite similar to BrianG's method, and follows what seems to be a current trend - a battery box. I cut a piece of 1/8" thick polycarbonate/Lexan that has a perimeter of about 1" around the battery. Then I cut a piece of 1/8" aluminum to be the same size as the battery. With the aluminum plate centered and taped onto the polycarbonate piece, I used a Mapp gas torch to bend the edges. The edges were bent around the aluminum plate, so I could get the best-shaped battery box possible. Some of the edges were a little rough, so the bench grinder did some work smoothing them out.
The box did not turn out as "pretty" as I would have liked, but it is VERY strong and completely functional (I prefer function over form anyways). The box is mounted to a piece of 1/4" thick polycarbonate/Lexan material (I call it the battery box mounting block). The mounting of the battery boxis where I deviated from BrianG's method for mounting the batteries. BrianG tapped his plastic mounting block so the screws threaded into the plastic. Instead, I drilled holes straight through the mounting block, and then milled out the holes in the block so that locknuts can secure the screws (but the locknuts do not protrude past the thickness of the block). This was done to secure both the box to the block and the block to the chassis.

Two Velcro straps will go perpendicular to the length of the battery, and a piece of foam is in front of the battery to add protection.

Unfortunately I don't have pics yet, but I will get some tomorrow.